One problem I’ve found is how does one practice? I don’t have spare motors or esc to use.
I practiced w/ some older and spare RC battery wire and a few bullet style battery posts.
As for holding the posts in place I use a battery, then used some "helping hands" to hold the wires in place and practiced that way. (you can get copper wire and solder some aligator clips to the ends to make your own "helping hands") or you can purchase some (they come in various styles, and materials).